User-defined type not defined on Copy to Clipboard Macro

So running a simple copy to clipboard macro and I am receiving a Compile error: User-defined type not defined error. This code worked on another spreadsheet where I had it embedded into a userform, so I'm a little confused as to the difference between the two events and why I'm receiving an error on this one.

Reference to the Microsoft Office 14.0 Object Library is active.
Reference to the Microsoft Excel 14.0 Object Library is active.

Sub CtrlC_CtrlV()

Dim obj As New DataObject
Dim txt As String

Do Until ActiveCell.Value = ""

'=============== Copy activecell to clipboard ====================

txt = ActiveCell.Value
obj.SetText txt
obj.PutInClipboard
MsgBox (txt & " is now ready to paste.")

'=============== Change Font to show what is completed =================

ActiveCell.Font.Color = vbRed
ActiveCell.Offset(1, 0).Select

Loop

End Sub